right|thumb|270px|Kashiwa City Hall is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 435,578 in 199,926 households and a population density of 3800 persons pe
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf283723d61e6bd5240e771139569be5dff4d89a81806c51407b9a69dbeb38d6c. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f751607-a435-46db-b586-8862040fb9f3.json and https://artists.proofprofile.net/proofs/artist/9f751607-a435-46db-b586-8862040fb9f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
真夏のライバルはフランクフルト
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39c974785d71888ee744cbafc6c0ea0951553b61c5345d634ab051eda96d85b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02401962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ca19465d88a386ea4d0d7c87717687ea9a5fd62591d936c8b9a1d5f403e01c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02401992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a52cc93ad219ddc5236a433e86f2fd491bcd389353f6233d7b74c8e51faf58. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI01902861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c1715a752641c4a83412eea72c88a38d9acfe8c2b2f55541ac85f9e61d8246. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI01902869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4600e15b06a542022e703e4b935dcabdec6f22a8c73684a24ebfe303edf7b38. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI01902870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54a7cd01e249469b253b613b2f4043f78b30c54b65b3a0088afda7798cb4196. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02100795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84284f185d7d9c38cd423ee7582e8f248da83ca515b535da64586377435f0fd5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T01:51:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02101753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0340ed244e183a3395c7cf8576fbec6664196a3431abec1799ab0bcfc3cce983. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:58:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI02500824.